alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TrustConnect RAT CnC Activity (Files Pending)"; flow:established,to_server; content:"GET"; http_method; content:"/api/files/pending/"; http_uri; depth:19; fast_pattern; pcre:"/^(?:[a-z0-9]{8})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{12})$/UR"; http_header_names; content:!"|0d 0a|referer|0d 0a|"; nocase; content:!"|0d 0a|x-"; nocase; threshold:type limit,count 1,seconds 300,track by_src; reference:md5,128e8469959cdb0a8e7e29eb84af0e79; classtype:command-and-control; sid:2067805; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_02_17, deployment Perimeter, deployment SSLDecrypt, malware_family TrustConnect, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)